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This page also describes how to apply for an OUI of your very own, which costs US $1,250 as of this writing. Note that the IEEE list of OUIs is not complete, since vendors can request not to be publically listed. This IEEE page provides search access to their list of OUIs and also provides download access to the entire IEEE OUI list. Search the IEEE Organizationally Unique Identifiers (OUIs). Knowing the vendor can often help you find out which machine on your network may be the one causing problems. For example, the OUI codes can help identify the vendor of a given Ethernet card that may be sending incorrect traffic. Troubleshooting with Ethernet Numbers OUI (vendor) codes and Type codes can help identify and track down machines and protocols in use on the network. This number is used to identify the type of high-level network protocol packet that is being carried in the data field of the Ethernet frame. Type Codes An Ethernet Type code is a 16-bit number carried in the Type field of the Ethernet frame. The Ethernet vendor combines their 24-bit OUI with a unique 24-bit value that they generate to create a unique 48-bit address for each Ethernet interface they build.
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The first 24 bits of the MAC address consist of an Organizationally Unique Identifier (OUI) assigned to a vendor by the IEEE, which is why they are also called vendor codes. MAC Addresses Each Ethernet interface is assigned a unique MAC address at the time of manufacture. Ethernet Numbers: Ethernet numbers include the 48-bit media access control (MAC) address assigned to each Ethernet interface, and the 16-bit value used in the Type field of the Ethernet frame.